Articles | Volume 17, issue 5
Biogeosciences, 17, 1231–1245, 2020
https://doi.org/10.5194/bg-17-1231-2020
Biogeosciences, 17, 1231–1245, 2020
https://doi.org/10.5194/bg-17-1231-2020

Research article 06 Mar 2020

Research article | 06 Mar 2020

Deep-sea sponge grounds as nutrient sinks: denitrification is common in boreo-Arctic sponges

Christine Rooks et al.

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Denitrification rates in boreo-arctic sponges - data of sponge species from Korsfjord (Norway) and the Schulz Bank (Arctic Ocean) C. Rooks, J. K.-H. Fang, P. T. Mørkved, R. Zhao, H. T. Rapp, J. R. Xavier, and F. Hoffmann https://doi.org/10.1594/PANGAEA.899821

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Short summary
Sponge grounds are known as nutrient sources, providing nitrate and ammonium to the ocean. We found that they also can do the opposite: in six species from Arctic and North Atlantic sponge grounds, we measured high rates of denitrification, which remove these nutrients from the sea. Rates were highest when the sponge tissue got low in oxygen, which happens when sponges stop pumping because of stress. Sponge grounds may become nutrient sinks when exposed to stress.
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